PYthon® MAGNUM is a sustained-release, plastic ear tag containing a synergized formulation of zetacypermethrin, a potent, enriched S-isomer pyrethroid compound. This insecticide has excellent activity against many pests, including horn flies that are resistant to certain other insecticides.

One tag per head controls most strains of horn flies and aids in control of face flies, stable flies and house flies for up to 4 months and controls pyrethroid susceptible horn flies for up to 5 months.